Final answer:
Adult neurogenesis in the hippocampus primarily aids in memory and learning, with new neurons being essential for learning new tasks and survival of these neurons correlating with improved learning abilities.
Step-by-step explanation:
One of the primary functions facilitated by adult neurogenesis in the hippocampus is memory and learning. Research has indicated that around 1000 new neurons are produced in the hippocampus each day, which play an important role in learning. While a significant number of these neurons will eventually die, a correlation has been found between the survival of new neurons and improved learning of new tasks in rats. Additionally, factors such as exercise and certain antidepressant medications can promote neurogenesis in the hippocampus, while stress can inhibit it.